[4.2.y-ckt stable] Patch "net: macb: replace macb_writel() call by queue_writel() to update queue ISR" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    net: macb: replace macb_writel() call by queue_writel() to update queue ISR

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From 1cfabd5054307aee133efd29439df4823358bdc2 Mon Sep 17 00:00:00 2001
From: Cyrille Pitchen <cyrille.pitchen at atmel.com>
Date: Thu, 24 Mar 2016 15:40:04 +0100
Subject: net: macb: replace macb_writel() call by queue_writel() to update
 queue ISR

commit ba5049945421b8d2f3e2af786a15d13b82316503 upstream.

macb_interrupt() should not use macb_writel(bp, ISR, <value>) but only
queue_writel(queue, ISR, <value>).

There is one IRQ and one set of {ISR, IER, IDR, IMR} [1] registers per
queue on gem hardware, though only queue0 is actually used for now to
receive frames: other queues can already be used to transmit frames.

The queue_readl() and queue_writel() helper macros are designed to access
the relevant IRQ registers.

[1]
ISR: Interrupt Status Register
IER: Interrupt Enable Register
IDR: Interrupt Disable Register
IMR: Interrupt Mask Register

Signed-off-by: Cyrille Pitchen <cyrille.pitchen at atmel.com>
Fixes: bfbb92c44670 ("net: macb: Handle the RXUBR interrupt on all devices")
Acked-by: Nicolas Ferre <nicolas.ferre at atmel.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/net/ethernet/cadence/macb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index bf9eb2e..db72a23 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -1104,7 +1104,7 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
 			macb_writel(bp, NCR, ctrl | MACB_BIT(RE));

 			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
-				macb_writel(bp, ISR, MACB_BIT(RXUBR));
+				queue_writel(queue, ISR, MACB_BIT(RXUBR));
 		}

 		if (status & MACB_BIT(ISR_ROVR)) {
--
2.7.4